Jennifer Lopez stopped at Best Buy in Los Angeles to promote the launch of Blackberry PlayBook with some lucky fans. At the event, she signed autographs for the first 200 fans who purchased the new Blackberry tablet or pre-ordered her new album 'LOVE?'. She then sent out tweets to her 1.5+ million twitter followers letting them know where she was going to be promoting the PlayBook, which created quite a stir and she had to exit out the back entrance to avoid the building mob of fans. You can see the tweet she sent out by going to her official Twitter page.